Simulation of thermal stresses in a multi-material item.
Simulation of thermal stresses in a multi-material item.

Glass fibre strengthens adhesive bonding

Joining multi-material products with adhesive bonding are noticeably affected by temperature variations, with stresses and reduced durability as a result. The Swerea Virtual Lab has shown that these stresses can be reduced.

The multi-material technique involves joining two or more materials to attain new and improved properties. An example is adhesive bonding of carbon fibre and metal reinforcement.

Prolonged life-cycle and less thermal stresses

A multi-material is noticeably affected by temperature variations during manufacture, adhesive bonding hardening and even during use. This causes thermal stresses that can damage adhesive joints and materials. 

In a group-wide initiative, researchers are working at the Swerea Virtual Lab with virtual development of materials, products and processes.

Glass fibres strengthen material

The goal of one of the projects is to increase the durability of multi-materials and to be able to guarantee product function throughout a product’s service life. Temperature variations have been simulated, using the finite element method, in a preliminary study of the multi-material to identify areas with high stress on the adhesive bonding.

The results from the study show that thermal stresses in the studied material can be reduced by inserting a glass fibre layer between the steel and carbon fibre laminate in the multi-material product.

Flexprop improved their skills with Virtual Lab

Swerea has conducted the project with Flexprop AB, a world-leader in lightweight engineering.

“Swerea is an important resource for strengthening our expertise and competitiveness. Without this collective expertise, it would be difficult to retain our world-leading position,” says Karl-Otto Strömberg, CEO for Flexprop.